How to Make a Conservatory Warmer (Pros & Cons of Every Option)

If you’re Googling how to make a conservatory warmer, chances are your space is lovely to look at… but not much fun to sit in from October to March.

The reason is simple: in most conservatories, the roof is the biggest culprit for heat loss (and summer overheating). That’s why quick fixes help a bit—but if you want a proper, year-round room, a conservatory roof replacement is usually the best long-term solution.

At K&S Bespoke Builds, we specialise in conservatory roof replacement in Oxford and across Berkshire. We assess the existing structure and how the room performs, then recommend changes that fix the real issues—not just the symptoms.

Let’s compare the main ways to warm a conservatory, with honest pros and cons.

A conservatory with a solid roof - so warm they open the windows!

Quick wins to make a conservatory warmer

1) Draught-proofing doors, windows and gaps

Pros

• Low cost

• Can make the room feel immediately less “drafty”

• Good first step before bigger upgrades

Cons

• Doesn’t solve heat loss through the roof

• If glazing is older or frames are tired, gains may be limited

Best for: conservatories that feel breezy rather than genuinely freezing.

Draught proofing a conservatory window

2) Thermal blinds and curtains

Pros

• Helps reduce heat loss through glazing at night

• Improves privacy and comfort

• Easy to upgrade room-by-room

Cons

• Can reduce light (especially in winter)

• Doesn’t fix temperature swings caused by an uninsulated roof

• You may still avoid using the room on very cold days

Best for: evening comfort and reducing “cold glass” feel.

Conservatory roof with thermal blinds

3) Add a rug + insulate underfoot (where possible)

Pros

• Makes the room feel warmer instantly

• Reduces that “cold floor” shock

• Good comfort upgrade even after roof improvements

Cons

• Only tackles one part of the heat-loss picture

• If you have condensation issues, you’ll want to address those too

Best for: spaces that are “nearly there” but still feel chilly.

Conservatory with rug

Heating upgrades (helpful, but only if the room holds heat)

4) Upgrading your heater (radiator, electric panel heater, underfloor heating)

Pros

• Can warm the room quickly

• Easy to control with thermostats/timers

Cons

• If the conservatory leaks heat, you’ll pay to heat the outdoors

• Doesn’t stop summer overheating

• Can increase bills without addressing the cause

Best for: conservatories that are already well insulated—or once the roof is sorted.

Conservatory with radiators installed

Mid-level fixes: roof insulation panels

5) Conservatory roof insulation panels (internal)

These are panels fitted to the inside of the roof to improve thermal performance.

Pros

• Often a noticeable improvement in comfort

• Helps reduce heat loss in winter and heat gain in summer

• Can reduce condensation risk and make the space more usable year-round

Cons

• You still keep the existing roof structure above

• Not always the “extension-like” look and feel people want

• Performance and finish depend heavily on the system and installation quality

Best for: homeowners who want improvement without replacing the entire roof.

Conservatory with internal insulation panels

The best long-term solution: conservatory roof replacement

6) Replace the conservatory roof with a modern warm roof

If you want the space to feel like a proper room, this is typically the biggest transformation.

Pros

• Designed to keep the room warmer in winter and cooler in summer 

• Can reduce glare and rain noise for a more comfortable, usable space

• Creates a smooth internal ceiling finish you can decorate like the rest of the house (less “conservatory”, more “extension”)

• Often improves long-term usability and can help reduce heating costs

Cons

• Higher upfront cost than blinds or panels

• Needs a proper survey of the existing structure and compliance considerations

Why K&S recommend this option most often: because it changes how the room performs, not just how it feels for an hour after you turn a heater on.

K&S install energy-efficient warm roof replacements and take time to inspect the existing structure, insulation and current performance so the end result is a genuine upgrade.

Before and after of a conservatory with its roof replaced

Why a Warmer Room roof replacement is built for year-round comfort

K&S use the Warmer Room system because it’s designed as a high-performance conservatory roof replacement approach, with:

• 125mm honeycomb insulation pre-fitted into roof/wall sections for thermal efficiency

• U-values quoted as low as 0.12 W/m²K (design/spec dependent)

• independent assessment including condensation risk analysis, designed to reduce moisture build-up within the construction

• an in-house process to help make Building Control approval smoother

• a smooth internal finish (insulated plasterboard ready to skim and decorate)

In plain English: it’s built to retain heat in winter, avoid the worst summer extremes, and make the conservatory feel like part of your home.

Which option should you choose?

Here’s the simplest way to decide:

• Just a bit chilly in the evenings? Start with blinds/curtains + draught-proofing.

• Cold most of the winter but you want a mid-cost upgrade? Consider insulation panels.

• You want a true year-round room (and the best “extension feel”)? Go for a conservatory roof replacement.